Question: 

Why does prepayment account not reflect in ‘Advanced customer payment’ under operating.

Use case:

I created an invoice prepayment account: $110 credit, AR $110 debit. But I don’t see $110 in cash flow statement. I see $25 instead.

Related cash flow statement document:

1. [V16] Odoo Cash Flow Statement: Why does the report have a limited journal selection? And why do we see expense accounts in the report?

https://www.odoo.com/fr_FR/forum/aide-1/v16-odoo-cash-flow-statement-why-does-the-report-have-a-limited-journal-selection-and-why-do-we-see-expense-accounts-in-the-report-235237

2. [V16] How does Odoo generate a Cash Flow Statement? (Operating, financing, and investing activities)

https://www.odoo.com/fr_FR/forum/aide-1/v16-how-does-odoo-generate-cash-flow-statement-operating-financing-investing-activities-235233